Предмет: Математика, автор: julianavakulchuk

ЛЮДИ ПОМОЖІТЬ БО НІЧОГО НЕ ЗНАЮ!!!!​

Приложения:

JiMoon: 4. (x, y) = (2, -2)
5.(x, y) = (10, -9)

Ответы

Автор ответа: iramazurk
0

Пошаговое объяснение:

4

{х + 4у = -6

{3х - у = 8

{х = -6 - 4у

{3х - у = 8

1)

3х - у = 8

3(-6 - 4у) - у = 8

-18 - 12у - у = 8

-12у - у = 8 + 18

-13у = 26

у = 26 : (-13)

у = -2

2)

х = -6 - 4у

х = -6 - 4 * (-2)

х = -6 + 8

х = 2

(2; -2)

5

{7х + 3у = 43

{4х - 3у = 67

{11х = 110

{7х + 3у = 43

1)

11х = 110

х = 110 : 11

х = 10

2)

7х + 3у = 43

7 * 10 + 3у = 43

70 + 3у = 43

3у = 43 - 70

3у = -27

у = -27 : 3

у = -9

(10; -9)

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